Rate of reaction (chemical kinetics)

Catalysts permit reactions to proceed along a ___________energy path.

• lower
• higher

Tags

NGSS.HS-PS1-4

You observe bubbles after adding metal to a solution. Do you assume a chemical reaction took place?

• Yes
• No

Tags

NGSS.HS-PS1-2

What is the meaning of the rate of reaction?

• Decrease in amount of product

• Decrease in amount of product against time

• Increase in amount of products against time

• Increase in amount of reactants against time

Tags

NGSS.HS-PS1-5

According to collision theory, when temperature is increased

• A. The number of particles with sufficient energy to collide also increases.

• B. The number of particles per unit volume increases.

• C. The kinetic energy of particles decreases.

• D. The number of collision decreases.

Calcium carbonate was reacted with hydrochloric acid in a conical flask. The flask was placed on a balance and the mass of the flask and contents was recorded as the reaction proceeded.

During the reaction, carbon dioxide gas was given off.

The reaction was carried out at two different temperatures. Which row is correct?

• A

• B

• C

• D

A student investigates the rate of reaction between marble chips and hydrochloric acid. The loss in mass of the reaction flask is measured.

The graph shows the results of two experiments, P and Q.

Which change explains the difference between P and Q?

• A catalyst is added in P.

• A higher temperature is used in P.

• Bigger marble chips are used in Q.

• Hydrochloric acid is more concentrated in Q.

A student investigates the rate of reaction between zinc and an excess of sulfuric acid. The graph shows the results of two experiments, X and Y.

Which change explains the difference between X and Y?

• A catalyst is added in Y.

• A lower temperature is used in Y.

• Larger pieces of zinc are used in Y.

• Less concentrated acid is used in Y.

Calcium carbonate reacts with hydrochloric acid to form carbon dioxide. Which changes would slow this reaction down?

1 decreasing the concentration of hydrochloric acid

2 decreasing the particle size of calcium carbonate

3 decreasing the temperature

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

• 1, 2 and 3

The rate of a reaction depends on temperature, concentration, particle size and catalysts. Which statement is not correct?

• Catalysts can be used to increase the rate of reaction.

• Higher concentration decreases the rate of reaction.

• Higher temperature increases the rate of reaction.

• Larger particle size decreases the rate of reaction.

Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?

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